You can use this indicator in 2 different ways:
- normal RSI: check double or triple top/bottom on a chart meanwhile is descending/ascending (check the example on chart)
- signal line: when Divergence cross zero line from bottom to top you get a buy signal (the line become green), vice versa when the Divergence cross zero line in the opposite way you get a sell signal (the line become red)
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.